JP3284693B2 - Method and apparatus for measuring leakage current between electrodes of cathode ray tube, and method and apparatus for inspecting cathode ray tube - Google Patents
Method and apparatus for measuring leakage current between electrodes of cathode ray tube, and method and apparatus for inspecting cathode ray tubeInfo
- Publication number
- JP3284693B2 JP3284693B2 JP23361393A JP23361393A JP3284693B2 JP 3284693 B2 JP3284693 B2 JP 3284693B2 JP 23361393 A JP23361393 A JP 23361393A JP 23361393 A JP23361393 A JP 23361393A JP 3284693 B2 JP3284693 B2 JP 3284693B2
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- Japan
- Prior art keywords
- voltage electrode
- medium
- voltage
- low
- leak current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Landscapes
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、陰極線管の電極間リー
ク電流測定方法及び測定装置並びに陰極線管の検査方法
及び検査装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring a leak current between electrodes of a cathode ray tube, and a method and an apparatus for inspecting a cathode ray tube.
【０００２】[0002]
【従来の技術】図３を参照して、ユニポテンシャル型電
子銃を備えた陰極線管のその電子銃を説明する。Ｈはヒ
ータ、Ｋはカソード、Ｇ１〜Ｇ５は第１〜第５グリッド
で、高圧電極であるグリッドＧ３及びＧ５に２０ｋＶ〜
３０ｋＶの高圧を印加し、グリッドＧ３及びＧ５間に位
置する中圧電極であるグリッドＧ４に中圧を印加して、
こられグリッドＧ３、Ｇ４、Ｇ５にてユニポテンシャル
レンズ（電子レンズ）を構成している。尚、カソードＫ
及びグリッドＧ１、Ｇ２は低圧電極である。中圧電極で
あるグリッドＧ４からは放電電流の抑制のためのＧ４リ
ード（セラミック抵抗体の如き高抵抗体）が導出され、
このＧ４リードの一部は低圧電極であるグリッドＧ１に
近接し、陰極線管のステムに至っている。2. Description of the Related Art Referring to FIG. 3, a description will be given of a cathode ray tube equipped with a unipotential type electron gun. H is a heater, K is a cathode, G1 to G5 are first to fifth grids, and 20 kV to grids G3 and G5 which are high voltage electrodes.
A high voltage of 30 kV is applied, and a medium pressure is applied to grid G4, which is a medium pressure electrode located between grids G3 and G5.
These grids G3, G4, G5 constitute a unipotential lens (electronic lens). The cathode K
And the grids G1 and G2 are low voltage electrodes. From the grid G4, which is a medium pressure electrode, a G4 lead (a high-resistance body such as a ceramic resistor) for suppressing a discharge current is led out.
A part of the G4 lead is close to the grid G1, which is a low-voltage electrode, and reaches the stem of the cathode ray tube.
【０００３】次に、図４を参照して、陰極線管の電極間
リーク電流測定装置の従来例を説明する。この陰極線管
の電子銃は、図３で説明したユニポテンシャル型電子銃
である。ＣＶはＣＲＴ特性試験機に設けられたＤＣ−Ｄ
Ｃコンバータで、低圧電源＋Ｂを用いて５ｋＶ程度の高
圧を発生する。このＤＣ−ＤＣコンバータＣＶの正端子
Ｔを５ｍ程度の導線を通じてグリッドＧ２、Ｇ４に各別
に接続し、負端子は電流検出用抵抗器Ｒ及び電圧計ＶＭ
の並列回路から成る電流計ＣＭを通じて接地される。そ
して、グリッドＧ３、Ｇ５に２０ｋＶ〜３０ｋＶ程度の
高圧を印加した状態で電流計ＣＭによって、端子Ｔをそ
れぞれグリッドＧ２、Ｇ４に各別に接続したときの電流
を測定して、陰極線管の電極間リーク電流を測定する。Next, a conventional example of a device for measuring a leak current between electrodes of a cathode ray tube will be described with reference to FIG. The electron gun of this cathode ray tube is the unipotential type electron gun described in FIG. CV is the DC-D provided in the CRT characteristic tester.
A C converter generates a high voltage of about 5 kV using a low voltage power supply + B. A positive terminal T of the DC-DC converter CV is connected to grids G2 and G4 through a conductor of about 5 m, and a negative terminal is connected to a current detecting resistor R and a voltmeter VM.
Are grounded through an ammeter CM composed of a parallel circuit. Then, while applying a high voltage of about 20 kV to 30 kV to the grids G3 and G5, the current when the terminal T is individually connected to the grids G2 and G4 is measured by the ammeter CM, and the leakage between the electrodes of the cathode ray tube is measured. Measure the current.
【０００４】次に、図５を参照して、陰極線管の電極間
リーク電流測定装置の先行例を説明する。この陰極線管
の電子銃は、図３で説明したユニポテンシャル型電子銃
である。グリッドＧ４と接地との間に、Ｇ４リードＬを
通じて、電流検出用抵抗器５Ｒ及び電圧計５Ｖの並列回
路から成る電流計５を接続すると共に、ヒータＨ、カソ
ードＫ及びグリッドＧ１、Ｇ２と接地との間に、電流検
出用抵抗器４Ｒ及び電圧計４Ｖの並列回路から成る電流
計４を接続する。そして、グリッドＧ３、Ｇ５に２０ｋ
Ｖ〜３０ｋＶ程度の高圧を印加した状態で、電流計４、
５によって電流を測定して、陰極線管の電極間リーク電
流を測定する。Next, with reference to FIG. 5, a prior art example of an apparatus for measuring a leak current between electrodes of a cathode ray tube will be described. The electron gun of this cathode ray tube is the unipotential type electron gun described in FIG. An ammeter 5 composed of a parallel circuit of a current detecting resistor 5R and a voltmeter 5V is connected between the grid G4 and the ground through a G4 lead L, and a heater H, a cathode K and the grids G1, G2 are connected to the ground. , An ammeter 4 composed of a parallel circuit of a current detection resistor 4R and a voltmeter 4V is connected. And, 20k on grids G3 and G5
With a high voltage of about V to 30 kV applied, the ammeter 4
The current is measured according to 5, and the leak current between the electrodes of the cathode ray tube is measured.
【０００５】[0005]
【発明が解決しようとする課題】図４の従来例は、ＣＲ
Ｔ特性試験機の高圧電源であるＤＣ−ＤＣコンバータＣ
Ｖの正端子Ｔと、電子銃のグリッドＧ２、Ｇ４との間に
長い導線を接続して陰極線管の電極間リーク電流の測定
を行うので、その導線の分布インダクタンス及び分布容
量及び塵埃等によるこれら値の変化等による外部リーク
電流の影響を受けるので、陰極線管の電極間リーク電流
の正確な測定（数１０ｎＡ程度の精度）は無理である。The conventional example shown in FIG.
DC-DC converter C which is a high-voltage power supply for T characteristic tester
A long lead is connected between the positive terminal T of V and the grids G2, G4 of the electron gun to measure the leak current between the electrodes of the cathode ray tube. Since it is affected by an external leak current due to a change in the value or the like, it is impossible to accurately measure the leak current between the electrodes of the cathode ray tube (accuracy of several tens nA).
【０００６】図５の先行例は、グリッドＧ４の電位が接
地電位に成った状態で陰極線管の電極間リーク電流を測
定するので、高圧電極であるグリッドＧ３、Ｇ５と、こ
れらに対向する中圧電極であるグリッドＧ４及び低圧電
極であるグリッドＧ１、Ｇ２との間を流れるリーク電流
は高感度で測定できるが、グリッドＧ１及びグリッドＧ
２のグリッドＧ１の側端面の傷に起因する中圧電極であ
るグリッドＧ４及び低圧電極であるグリッドＧ１、Ｇ２
間を流れるリーク電流の測定感度はかなり低く成る。In the prior art shown in FIG. 5, the leak current between the electrodes of the cathode ray tube is measured in a state where the potential of the grid G4 is at the ground potential. Therefore, the grids G3 and G5, which are high voltage electrodes, and the medium The leak current flowing between the grid G4 as an electrode and the grids G1 and G2 as low-voltage electrodes can be measured with high sensitivity.
The grid G4, which is a medium-voltage electrode, and the grids G1, G2, which are low-voltage electrodes, caused by scratches on the side end surface of the second grid G1.
The measurement sensitivity of the leak current flowing between them is considerably reduced.
【０００７】かかる点に鑑み、第１の本発明は、高圧電
極、中圧電極及び低圧電極を備える電子銃と、低圧電極
に近接する如く中圧電極及びステム間に配され、中圧電
極に接続された継線とを有する陰極線管の電極間リーク
電流測定方法において、高圧電極と、中圧電極及び低圧
電極との間のリーク電流並びに中圧電極と低圧電極との
間のリーク電流を共に高感度且つ高精度で測定すること
のできる測定方法を提案しようとするものである。又、
第２の本発明は、高圧電極、中圧電極及び低圧電極を備
える電子銃と、低圧電極に近接する如く中圧電極及びス
テム間に配され、中圧電極に接続された継線とを有する
陰極線管の電極間リーク電流測定装置において、高圧電
極と、中圧電極及び低圧電極との間のリーク電流並びに
中圧電極と低圧電極との間のリーク電流を共に高感度且
つ高精度で測定することのできる測定装置を提案しよう
とするものである。更に、第３の本発明は、高圧電極、
中圧電極及び低圧電極を備える電子銃と、低圧電極に近
接する如く中圧電極及びステム間に配され、中圧電極に
接続された継線とを有する陰極線管の検査方法におい
て、陰極線管の良否を高感度且つ高精度に検査すること
のできる検査方法を提案しようとするものである。更
に、第４の本発明は、高圧電極、中圧電極及び低圧電極
を備える電子銃と、低圧電極に近接する如く中圧電極及
びステム間に配され、中圧電極に接続された継線とを有
する陰極線管の検査装置において、陰極線管の良否を高
感度且つ高精度に検査することのできる検査装置を提案
しようとするものである。In view of the above, a first aspect of the present invention is to provide an electron gun having a high-voltage electrode, a medium-voltage electrode, and a low-voltage electrode, and an electron gun disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode. In the method for measuring the leak current between the electrodes of a cathode ray tube having a connected wire, the leak current between the high-voltage electrode, the medium-voltage electrode and the low-voltage electrode, and the leak current between the medium-voltage electrode and the low-voltage electrode are both measured. An object of the present invention is to propose a measuring method capable of measuring with high sensitivity and high accuracy. or,
The second invention has an electron gun including a high-voltage electrode, a medium-voltage electrode, and a low-voltage electrode, and a connecting wire disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode and connected to the medium-voltage electrode. In a cathode ray tube inter-electrode leak current measuring device, a leak current between a high voltage electrode, a medium voltage electrode and a low voltage electrode, and a leak current between a medium voltage electrode and a low voltage electrode are both measured with high sensitivity and high accuracy. It is intended to propose a measuring device that can perform the measurement. Further, a third invention provides a high-voltage electrode,
In a method of inspecting a cathode ray tube having an electron gun including a medium-voltage electrode and a low-voltage electrode, and a connecting wire disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode and connected to the medium-voltage electrode, An object of the present invention is to propose an inspection method capable of inspecting quality with high sensitivity and high accuracy. Further, a fourth invention is directed to an electron gun including a high-voltage electrode, a medium-voltage electrode and a low-voltage electrode, and a connecting wire disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode and connected to the medium-voltage electrode. An object of the present invention is to propose an inspection apparatus which can inspect the quality of a cathode ray tube with high sensitivity and high accuracy in a cathode ray tube inspection apparatus having the above.
【０００８】[0008]
【課題を解決するための手段】第１の本発明は、高圧電
極、中圧電極及び低圧電極を備える電子銃と、低圧電極
に近接する如く中圧電極及びステム間に配され、その中
圧電極に接続された継線とを有する陰極線管の電極間リ
ーク電流測定方法において、高圧電極に高圧電圧を印加
すると共に、中圧電極に接地電圧を印加した状態で、高
圧電極及び中圧電極間のリーク電流並びに高圧電極及び
低圧電極間のリーク電流を測定し、高圧電極に高圧電圧
を印加すると共に、中圧電極に中圧電圧を印加した状態
で、中圧電極に接続された継線及び低圧電極間のリーク
電流を測定するもようにした陰極線管の電極間リーク電
流測定方法である。第２の本発明は、高圧電極、中圧電
極及び低圧電極を備える電子銃と、低圧電極に近接する
如く中圧電極及びステム間に配され、その中圧電極に接
続された継線とを有する陰極線管の電極間リーク電流測
定装置において、高圧電極及び接地間に接続され、その
高圧電極に高圧電圧を印加する高圧電源と、継線を通じ
て中圧電極に接続された可動接点並びにその可動接点が
切換え接続される第１及び第２の固定接点を備えるスイ
ッチ手段と、そのスイッチ手段の第１の固定接点及び接
地間に接続された第１の電流計と、スイッチ手段の第２
の固定接点及び接地間に接続され、そのスイッチ手段を
通じて、中圧電極に中圧電圧を印加する中圧電源と、低
圧電極及び接地間に接続された第２の電流計とを有し、
可動接点が第１の固定接点に接続されるようにスイッチ
手段を切り換えた状態で、第１の電流計によって高圧電
極及び中圧電極間のリーク電流を測定すると共に、第２
の電流計によって高圧電極及び低圧電極間のリーク電流
を測定し、可動接点が第２の固定接点に接続されるよう
にスイッチ手段を切り換えた状態で、第２の電流計によ
って中圧電極に接続された継線及び低圧電極間のリーク
電流を測定するようにした陰極線管の電極間リーク電流
測定装置である。第３の本発明は、高圧電極、中圧電極
及び低圧電極を備える電子銃と、低圧電極に近接する如
く中圧電極及びステム間に配され、その中圧電極に接続
された継線とを有する陰極線管の検査方法において、高
圧電極に高圧電圧を印加すると共に、中圧電極に接地電
圧を印加した状態で、高圧電極及び中圧電極間のリーク
電流並びに高圧電極及び低圧電極間のリーク電流を測定
し、高圧電極に高圧電圧を印加すると共に、中圧電極に
中圧電圧を印加した状態で、中圧電極に接続された継線
及び低圧電極間のリーク電流を測定し、高圧電極及び中
圧電極間のリーク電流、高圧電極及び低圧電極間のリー
ク電流並びに中圧電極に接続された継線及び低圧電極間
のリーク電流のいずれかが、それぞれのリーク電流の閾
値以上であるときは、陰極線管を不合格製品と判定する
ようにした陰極線管の検査方法である。第４の本発明
は、高圧電極、中圧電極及び低圧電極を備える電子銃
と、低圧電極に近接する如く中圧電極及びステム間に配
され、その中圧電極に接続された継線とを有する陰極線
管の検査装置において、高圧電極及び接地間に接続さ
れ、その高圧電極に高圧電圧を印加する高圧電源と、継
線を通じて中圧電極に接続された可動接点並びにその可
動接点が切換え接続される第１及び第２の固定接点を備
えるスイッチ手段と、そのスイッチ手段の第１の固定接
点及び接地間に接続された第１の電流計と、スイッチ手
段の第２の固定接点及び接地間に接続され、そのスイッ
チ手段を通じて、中圧電極に中圧電圧を印加する中圧電
源と、低圧電極及び接地間に接続された第２の電流計と
を有し、可動接点が第１の固定接点に接続されるように
スイッチ手段を切り換えた状態で、第１の電流計によっ
て高圧電極及び中圧電極間のリーク電流を測定すると共
に、第２の電流計によって高圧電極及び低圧電極間のリ
ーク電流を測定し、可動接点が第２の固定接点に接続さ
れるようにスイッチ手段を切り換えた状態で、第２の電
流計によって中圧電極に接続された継線及び低圧電極間
のリーク電流を測定し、高圧電極及び中圧電極間のリー
ク電流、高圧電極及び低圧電極間のリーク電流並びに中
圧電極に接続された継線及び低圧電極間のリーク電流の
いずれかが、それぞれのリーク電流の閾値以上であると
きは、陰極線管を不合格製品と判定するようにした陰極
線管の検査装置である。According to a first aspect of the present invention, there is provided an electron gun having a high-voltage electrode, a medium-voltage electrode, and a low-voltage electrode, and disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode. In a method for measuring a leak current between electrodes of a cathode ray tube having a connecting wire connected to an electrode, a high voltage is applied to a high voltage electrode, and a ground voltage is applied to a medium voltage electrode. The leak current between the high-voltage electrode and the low-voltage electrode is measured, and the high-voltage electrode is applied to the high-voltage electrode, and the medium-voltage electrode is applied with the medium-voltage voltage. This is a method for measuring a leak current between electrodes of a cathode ray tube, which measures a leak current between low voltage electrodes. According to a second aspect of the present invention, there is provided an electron gun including a high-voltage electrode, a medium-voltage electrode, and a low-voltage electrode, and a connecting wire disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode and connected to the medium-voltage electrode. A high-voltage power supply connected between the high-voltage electrode and the ground and applying a high-voltage to the high-voltage electrode, a movable contact connected to the medium-voltage electrode through a connecting wire, and the movable contact Switch means comprising first and second fixed contacts to which switching is connected, a first ammeter connected between the first fixed contact and ground of the switch means, and a second ammeter of the switch means.
And a second ammeter connected between the fixed contact and ground, applying a medium voltage to the medium voltage electrode through the switch means, and a second ammeter connected between the low voltage electrode and ground,
With the switch means switched so that the movable contact is connected to the first fixed contact, the first ammeter measures the leakage current between the high-voltage electrode and the medium-voltage electrode, and
The leak current between the high-voltage electrode and the low-voltage electrode is measured by the ammeter, and the switch is switched so that the movable contact is connected to the second fixed contact. This is a device for measuring a leak current between electrodes of a cathode ray tube, which measures a leak current between the connected connection wire and the low-voltage electrode. According to a third aspect of the present invention, there is provided an electron gun including a high-voltage electrode, a medium-voltage electrode, and a low-voltage electrode, and a connecting wire disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode and connected to the medium-voltage electrode. In the inspection method of a cathode ray tube having a high voltage applied to the high voltage electrode and a ground voltage applied to the medium voltage electrode, the leakage current between the high voltage electrode and the medium voltage electrode and the leakage current between the high voltage electrode and the low voltage electrode And applying a high voltage to the high voltage electrode, while applying the medium voltage to the medium voltage electrode, measuring the leakage current between the connecting wire connected to the medium voltage electrode and the low voltage electrode, and measuring the high voltage electrode and When any of the leak current between the medium-voltage electrodes, the leak current between the high-voltage electrode and the low-voltage electrode, and the leak current between the connecting wire and the low-voltage electrode connected to the medium-voltage electrode is equal to or more than the threshold value of the respective leak currents The cathode ray tube A cathode ray tube inspection method which is adapted to determine that rated products. According to a fourth aspect of the present invention, there is provided an electron gun including a high-voltage electrode, a medium-voltage electrode and a low-voltage electrode, and a connecting wire disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode and connected to the medium-voltage electrode. In a cathode ray tube inspection apparatus having a high voltage power supply connected between a high voltage electrode and a ground and applying a high voltage to the high voltage electrode, a movable contact connected to the medium voltage electrode through a connecting wire and the movable contact are switched and connected. Switch means comprising first and second fixed contacts, a first ammeter connected between the first fixed contact and ground of the switch means, and a second ammeter connected between the second fixed contact and ground of the switch means. A medium voltage power supply for applying a medium voltage to the medium voltage electrode through the switch means, and a second ammeter connected between the low voltage electrode and ground, wherein the movable contact is a first fixed contact Switch to be connected to With the stages switched, the first ammeter measures the leak current between the high voltage electrode and the medium voltage electrode, and the second ammeter measures the leak current between the high voltage electrode and the low voltage electrode. In a state where the switch means is switched so as to be connected to the second fixed contact, a leak current between the connecting wire connected to the medium voltage electrode and the low voltage electrode is measured by the second ammeter, and the high voltage electrode and the medium voltage are measured. When any of the leak current between the electrodes, the leak current between the high-voltage electrode and the low-voltage electrode, and the leak current between the connecting wire and the low-voltage electrode connected to the medium-voltage electrode is equal to or more than the threshold value of the respective leak current, the cathode line This is a cathode ray tube inspection device that determines a tube as a rejected product.
【０００９】[0009]
【作用】かかる第１の本発明の陰極線管の電極間リーク
電流測定方法によれば、高圧電極に高圧電圧を印加する
と共に、中圧電極に接地電圧を印加した状態で、高圧電
極及び中圧電極間のリーク電流並びに高圧電極及び低圧
電極間のリーク電流を測定し、高圧電極に高圧電圧を印
加すると共に、中圧電極に中圧電圧を印加した状態で、
中圧電極に接続された継線及び低圧電極間のリーク電流
を測定する。又、第２の本発明の陰極線管の電極間リー
ク電流測定装置によれば、可動接点が第１の固定接点に
接続されるようにスイッチ手段を切り換えた状態で、第
１の電流計によって高圧電極及び中圧電極間のリーク電
流を測定すると共に、第２の電流計によって高圧電極及
び低圧電極間のリーク電流を測定し、可動接点が第２の
固定接点に接続されるようにスイッチ手段を切り換えた
状態で、第２の電流計によって中圧電極に接続された継
線及び低圧電極間のリーク電流を測定する。更に、第３
の本発明の陰極線管の検査方法によれば、高圧電極に高
圧電圧を印加すると共に、中圧電極に接地電圧を印加し
た状態で、高圧電極及び中圧電極間のリーク電流並びに
高圧電極及び低圧電極間のリーク電流を測定し、高圧電
極に高圧電圧を印加すると共に、中圧電極に中圧電圧を
印加した状態で、中圧電極に接続された継線及び低圧電
極間のリーク電流を測定し、高圧電極及び中圧電極間の
リーク電流、高圧電極及び低圧電極間のリーク電流並び
に中圧電極に接続された継線及び低圧電極間のリーク電
流のいずれかが、それぞれのリーク電流の閾値以上であ
るときは、陰極線管を不合格製品と判定する。更に、第
４の本発明の陰極線管の検査装置によれば、可動接点が
第１の固定接点に接続されるようにスイッチ手段を切り
換えた状態で、第１の電流計によって高圧電極及び中圧
電極間のリーク電流を測定すると共に、第２の電流計に
よって高圧電極及び低圧電極間のリーク電流を測定し、
可動接点が第２の固定接点に接続されるようにスイッチ
手段を切り換えた状態で、第２の電流計によって中圧電
極に接続された継線及び低圧電極間のリーク電流を測定
し、高圧電極及び中圧電極間のリーク電流、高圧電極及
び低圧電極間のリーク電流並びに中圧電極に接続された
継線及び低圧電極間のリーク電流のいずれかが、それぞ
れのリーク電流の閾値以上であるときは、陰極線管を不
合格製品と判定する。According to the first method for measuring a leak current between electrodes of a cathode ray tube according to the first aspect of the present invention, a high voltage is applied to the high voltage electrode, and a ground voltage is applied to the medium voltage electrode. Measure the leak current between the electrodes and the leak current between the high-voltage electrode and the low-voltage electrode, apply a high-voltage to the high-voltage electrode, and apply a medium-voltage to the medium-voltage electrode.
The leak current between the connecting wire connected to the medium voltage electrode and the low voltage electrode is measured. Further, according to the second aspect of the present invention, in the state where the switching means is switched so that the movable contact is connected to the first fixed contact, the high voltage is measured by the first ammeter. A leak current between the electrode and the medium-voltage electrode is measured, and a leak current between the high-voltage electrode and the low-voltage electrode is measured by a second ammeter, and switch means is connected so that the movable contact is connected to the second fixed contact. In the switched state, the leak current between the connecting wire connected to the medium voltage electrode and the low voltage electrode is measured by the second ammeter. Furthermore, the third
According to the cathode ray tube inspection method of the present invention, while applying a high voltage to the high voltage electrode and applying a ground voltage to the medium voltage electrode, the leak current between the high voltage electrode and the medium voltage electrode, and the high voltage electrode and the low voltage Measure the leak current between the electrodes, apply the high voltage to the high voltage electrode, and measure the leakage current between the connecting wire connected to the medium voltage electrode and the low voltage electrode while applying the medium voltage to the medium voltage electrode. The leakage current between the high-voltage electrode and the medium-voltage electrode, the leakage current between the high-voltage electrode and the low-voltage electrode, and the leakage current between the connecting wire and the low-voltage electrode connected to the medium-voltage electrode are each a threshold value of the leakage current. If the above is true, the cathode ray tube is determined to be a rejected product. Further, according to the cathode ray tube inspection apparatus of the fourth aspect of the invention, the high voltage electrode and the medium voltage are applied by the first ammeter while the switch means is switched so that the movable contact is connected to the first fixed contact. While measuring the leak current between the electrodes, the leak current between the high-voltage electrode and the low-voltage electrode is measured by the second ammeter,
In a state where the switch means is switched so that the movable contact is connected to the second fixed contact, a leak current between the connecting wire connected to the medium voltage electrode and the low voltage electrode is measured by a second ammeter, and the high voltage electrode is measured. And any of the leak current between the medium-voltage electrode, the leak current between the high-voltage electrode and the low-voltage electrode, and the leak current between the connecting wire connected to the medium-voltage electrode and the low-voltage electrode is equal to or more than the threshold value of the respective leak current. Judges the cathode ray tube as a rejected product.
【００１０】[0010]
【実施例】以下に、図面を参照して、本発明の実施例を
詳細に説明する。先ず、図１を参照して、本発明の実施
例（１）を説明する。この陰極線管の電子銃は、図３で
説明したユニポテンシャル型電子銃である。Embodiments of the present invention will be described below in detail with reference to the drawings. First, an embodiment (1) of the present invention will be described with reference to FIG. The electron gun of this cathode ray tube is the unipotential type electron gun described in FIG.
【００１１】切換えスイッチ３の可動接点３ｃを、グリ
ッドＧ４に接続されている放電防止用の高抵抗体である
Ｇ４リードＬのステム側の端部、即ち、Ｇ４ピンに接続
し、その一方の固定接点３ａと接地との間に、電流検出
用抵抗器５Ｒ及び電圧計５Ｖの並列回路から成る電流計
５を接続し、他方の固定接点３ｂに中圧電圧（但し、動
作電圧に比べて十分高い電圧、例えば、５ｋＶ）の電源
２の正端子に接続し、その負端子を接地する。The movable contact 3c of the changeover switch 3 is connected to the stem-side end of the G4 lead L, which is a high-resistance element for discharge prevention, connected to the grid G4, that is, the G4 pin, and one of the fixed contacts is fixed. An ammeter 5 composed of a parallel circuit of a current detection resistor 5R and a voltmeter 5V is connected between the contact 3a and the ground, and the other fixed contact 3b is connected to an intermediate voltage (however, sufficiently higher than the operating voltage). A voltage, for example, 5 kV) is connected to the positive terminal of the power supply 2 and its negative terminal is grounded.
【００１２】ヒータＨ、カソードＫ及びグリッドＧ１、
Ｇ２と接地との間に、電流検出用抵抗器４Ｒ及び電圧計
４Ｖの並列回路から成る電流計４を接続する。The heater H, the cathode K and the grid G1,
An ammeter 4 composed of a parallel circuit of a current detection resistor 4R and a voltmeter 4V is connected between G2 and the ground.
【００１３】そして、グリッドＧ３、Ｇ５に、電源１に
よって、動作電圧である２０ｋＶ〜３０ｋＶの高圧を印
加した状態で、切換えスイッチ３の可動接点３ｃをそれ
ぞれ固定接点３ａ、３ｂに切り換えて、電流計４、５に
よって電流を測定する。Then, with the power supply 1 applying a high voltage of 20 kV to 30 kV, which is an operating voltage, to the grids G3 and G5, the movable contact 3c of the changeover switch 3 is switched to the fixed contacts 3a and 3b, respectively. The current is measured according to 4,5.
【００１４】かくすると、切換えスイッチ３の可動接点
３ｃを一方の固定接点３ａ側に切換えたときは、グリッ
ドＧ３、Ｇ５に高圧が印加され、グリッドＧ４に接地電
圧が印加れた状態で、電流計５によって、グリッドＧ５
とＧ４との間のリーク電流が検出されると共に、電流計
４によって、グリッドＧ５と、グリッドＧ１、Ｇ２及び
カソードＫとの間のリーク電流が検出される。Thus, when the movable contact 3c of the changeover switch 3 is switched to the one fixed contact 3a, a high voltage is applied to the grids G3 and G5, and an ammeter is applied while the ground voltage is applied to the grid G4. 5, the grid G5
The leak current between the grid G5 and the grid G5 and between the grids G1, G2 and the cathode K is detected by the ammeter 4 while the leak current between the grid G5 and the cathode K is detected.
【００１５】又、切換えスイッチ３の可動接点３ｃを他
方の固定接点３ｂに側に切換えたときは、グリッドＧ
３、Ｇ５に高圧が印加されると共に、グリッドＧ４に中
圧が印加された状態で、電流計４によって、グリッドＧ
４のＧ４リードＬと、グリッドＧ１、Ｇ２及びカソード
Ｋとの間のリーク電流が検出される。When the movable contact 3c of the changeover switch 3 is switched to the other fixed contact 3b, the grid G
3. With the high voltage applied to G5 and the medium pressure applied to grid G4,
No. 4, a leak current between the G4 lead L, the grids G1, G2 and the cathode K is detected.
【００１６】この実施例の場合、リーク電流の分解能は
２００ｎＡ程度で、リーク電流が、例えば、閾値である
５０ｎＡ以上の陰極線管を不合格製品と判定することが
できる。この閾値は陰極線管の種類、パネルの大きさ等
によって異なる。In this embodiment, the resolution of the leak current is about 200 nA, and a cathode ray tube having a leak current of, for example, a threshold value of 50 nA or more can be determined as a rejected product. This threshold varies depending on the type of the cathode ray tube, the size of the panel, and the like.
【００１７】次に、図２を参照して、本発明の他の実施
例を説明する。この陰極線管の電子銃は、バイユニポテ
ンシャル型の電子銃である。Ｈはヒータ、Ｋはカソー
ド、Ｇ１〜Ｇ６は第１〜第６グリッドで、高圧電極であ
るグリッドＧ６に１８ｋＶの高圧を印加し、高圧電極で
あるグリッドＧ３、Ｇ５に４ｋＶの高圧を印加し、中圧
電極であるグリッドＧ４、Ｇ２に６００Ｖの中圧を印加
して、グリッドＧ３、Ｇ４、Ｇ５でユニポテンシャルレ
ンズを構成し、グリッドＧ５、Ｇ６でバイポテンシャル
レンズを構成している。尚、カソードＫ及びグリッドＧ
１、カソードＫは低圧電極である。中圧電極であるグリ
ッドＧ２、Ｇ４からは放電電流の抑制のためのリード
（セラミック抵抗体の如き高抵抗体）Ｌ１が導出され、
このリードＬ１の一部は低圧電極であるグリッドＧ１に
近接し、陰極線管のステムの至っている。又、高圧電極
であるグリッドＧ３、Ｇ５からは放電電流の抑制のため
のリード（セラミック抵抗体の如き高抵抗体）Ｌ２が導
出され、このリードＬ２の一部は中圧電極であるグリッ
ドＧ２及び低圧電極であるグリッドＧ１に近接し、陰極
線管のステムに至っている。Next, another embodiment of the present invention will be described with reference to FIG. The electron gun of this cathode ray tube is a bi-unipotential type electron gun. H is a heater, K is a cathode, G1 to G6 are first to sixth grids, a high voltage of 18 kV is applied to the grid G6 which is a high voltage electrode, and a high voltage of 4 kV is applied to the grids G3 and G5 which are high voltage electrodes. When a medium pressure of 600 V is applied to the grids G4 and G2, which are medium pressure electrodes, the grids G3, G4 and G5 constitute a unipotential lens, and the grids G5 and G6 constitute a bipotential lens. The cathode K and the grid G
1. The cathode K is a low voltage electrode. Leads (high-resistance elements such as ceramic resistors) L1 for suppressing discharge current are led out from the grids G2 and G4, which are medium-voltage electrodes.
A part of the lead L1 is close to the grid G1, which is a low-voltage electrode, and reaches the stem of the cathode ray tube. Leads (high-resistance elements such as ceramic resistors) L2 for suppressing discharge current are led out from the grids G3 and G5, which are high-voltage electrodes, and a part of the leads L2 is a grid G2 and a medium-voltage electrode. It is close to the grid G1, which is a low voltage electrode, and reaches the stem of the cathode ray tube.
【００１８】切換えスイッチ９の可動接点９ｃを、グリ
ッドＧ３、Ｇ５に接続されている放電防止用の高抵抗体
であるリードＬ２のステム側の端部、即ち、Ｇ３−Ｇ５
ピンに接続し、その一方の固定接点９ａと接地との間
に、電流検出用抵抗器１０Ｒ及び電圧計１０Ｖの並列回
路から成る電流計１０を接続し、他方の固定接点９ｂに
高圧電圧（但し、動作電圧に略等しい、例えば、４ｋ
Ｖ）の電源７の正端子に接続し、その負端子を接地す
る。The movable contact 9c of the change-over switch 9 is connected to the stem-side end of the lead L2, which is a high resistance body for discharge prevention, connected to the grids G3 and G5, that is, G3-G5.
A current meter 10 comprising a parallel circuit of a current detection resistor 10R and a voltmeter 10V is connected between one fixed contact 9a and the ground, and a high voltage (except for a high voltage (not , Approximately equal to the operating voltage, for example, 4k
V) to the positive terminal of the power supply 7, and ground the negative terminal.
【００１９】切換えスイッチ１１の可動接点１１ｃを、
グリッドＧ２、Ｇ４に接続されている放電防止用の高抵
抗体であるリードＬ１のステム側の端部、即ち、Ｇ２−
Ｇ４ピンに接続し、その一方の固定接点１１ａと接地と
の間に、電流検出用抵抗器１３Ｒ及び電圧計１３Ｖの並
列回路から成る電流計１３を接続し、他方の固定接点１
１ｂを中圧電圧（但し、動作電圧より十分高い、例え
ば、４ｋＶ）の電源８の正端子に接続し、その負端子を
接地する。The movable contact 11c of the changeover switch 11 is
The stem-side end of the lead L1, which is a high-resistance body for preventing discharge, connected to the grids G2, G4, that is, G2-
G4 pin, an ammeter 13 composed of a parallel circuit of a current detection resistor 13R and a voltmeter 13V is connected between one fixed contact 11a and the ground, and the other fixed contact 1
1b is connected to the positive terminal of a power supply 8 of a medium voltage (however, sufficiently higher than the operating voltage, for example, 4 kV), and its negative terminal is grounded.
【００２０】グリッドＧ１、カソードＫ及びヒータＨと
接地との間に、電流検出用抵抗器１２Ｒ及び電圧計１２
Ｖの並列回路から成る電流計１２を接続する。Between the grid G1, the cathode K and the heater H and the ground, a current detecting resistor 12R and a voltmeter 12
An ammeter 12 consisting of a V parallel circuit is connected.
【００２１】そして、グリッドＧ６に、電源６によっ
て、動作電圧である１８ｋＶの高圧を印加した状態で、
切換えスイッチ９の可動接点９ｃをそれぞれ固定接点９
ｂ、９ａに切り換えると共に、これと連動して切換えス
イッチ１１の可動接点１１ｃをそれぞれ固定接点１１
ａ、１１ｂに切り換えて、電流計１０、１２、１３によ
って電流を測定する。Then, with a high voltage of 18 kV, which is an operating voltage, applied to the grid G6 by the power supply 6,
The movable contact 9c of the changeover switch 9 is
b, 9a, and in conjunction with this, the movable contact 11c of the changeover switch 11 is set to the fixed contact 11
The current is measured by the ammeters 10, 12, and 13 after switching to a and 11b.
【００２２】かくすると、切換えスイッチ９の可動接点
９ｃを一方の固定接点９ｂ側に切換えると共に、切換え
スイッチ１１の可動接点１１ｃを一方の固定接点１１ａ
に切り換えたときは、グリッドＧ６に電源６によって高
圧が印加されると共に、グリッドＧ３、Ｇ５に電源７に
よって高圧が印加された状態で、電流計１３によって、
グリッドＧ５、Ｇ３のリードＬ２と、グリッドＧ４、Ｇ
２と間のリーク電流が測定されると共に、電流計１２に
よって、グリッドＧ５、Ｇ３のリードＬ２と、グリッド
Ｇ１及びカソードＫとの間のリーク電流が測定される。Thus, the movable contact 9c of the changeover switch 9 is switched to the one fixed contact 9b, and the movable contact 11c of the changeover switch 11 is changed to the one fixed contact 11a.
When the high voltage is applied to the grid G6 by the power supply 6 and the high voltage is applied to the grids G3 and G5 by the power supply 7,
Leads L2 of grids G5 and G3 and grids G4 and G
2, and the ammeter 12 measures the leak current between the leads L2 of the grids G5 and G3, and the grid G1 and the cathode K.
【００２３】又、切換えスイッチ９の可動接点９ｃを他
方の固定接点９ａ側に切換えると共に、切換えスイッチ
１１の可動接点１１ｃを他方の固定接点１１ｂに切り換
えたときは、グリッドＧ６に電源６によって高圧が印加
されると共に、グリッドＧ２、Ｇ４に電源８によって高
圧が印加された状態で、電流計１０によって、グリッド
Ｇ６と、グリッドＧ３、Ｇ５との間のリーク電流が検出
されると共に、電流計１２によって、グリッドＧ６及び
グリッドＧ４、Ｇ２のリードＬ１と、グリッドＧ１及び
カソードＫとの間のリーク電流が測定される。When the movable contact 9c of the changeover switch 9 is switched to the other fixed contact 9a and the movable contact 11c of the changeover switch 11 is switched to the other fixed contact 11b, a high voltage is applied to the grid G6 by the power source 6. While the voltage is applied and the high voltage is applied to the grids G2 and G4 by the power supply 8, the leak current between the grid G6 and the grids G3 and G5 is detected by the ammeter 10, and the ammeter 12 detects the leak current. , The grid G6 and the leads L1 of the grids G4 and G2, and the leak current between the grid G1 and the cathode K are measured.
【００２４】尚、本発明は、上述したユニポテンシャル
型電子銃及びバイユニポテンシャル型電子銃に限らず、
バイポテンシャル型電子銃、ハイバイポテンシャル型電
子銃、トライポテンシャル型電子銃、ハイユニポテンシ
ャル型電子銃、バイユニポテンシャル型電子銃を有する
陰極線管の電極間リーク電流測定方法及び測定装置並び
に陰極線管の検査方法及び検査装置にも適用できる。The present invention is not limited to the above-described unipotential electron gun and bi-unipotential electron gun,
Bipotential electron gun, high bipotential electron gun, tripotential electron gun, high unipotential electron gun, method and apparatus for measuring leak current between electrodes of cathode ray tube having biunipotential electron gun, and method of inspecting cathode ray tube And it can also be applied to inspection equipment.
【００２５】上述せる陰極線管の電極間リーク電流測定
回路にれば、高圧電極、中圧電極及び低圧電極を備える
電子銃と、低圧電極に近接する如く中圧電極及びステム
間に配され、中圧電極に接続された継線とを有する陰極
線管の高圧電極と、中圧電極及び低圧電極との間のリー
ク電流並びに中圧電極と低圧電極との間のリーク電流を
共に高感度且つ高精度で測定することができ、且つ、リ
ーク電流の測定を迅速に行い得ると共に、回路構成が簡
単と成る。According to the above-described circuit for measuring the leak current between electrodes of a cathode ray tube, the electron gun including the high-voltage electrode, the medium-voltage electrode and the low-voltage electrode is disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode. High-sensitivity and high-precision both leak current between the high-voltage electrode of the cathode ray tube having the connecting wire connected to the high-voltage electrode, the medium-voltage electrode and the low-voltage electrode, and the leak current between the medium-voltage electrode and the low-voltage electrode And the leak current can be measured quickly, and the circuit configuration is simplified.
【００２６】[0026]
【発明の効果】上述せる第１の本発明によれば、高圧電
極、中圧電極及び低圧電極を備える電子銃と、低圧電極
に近接する如く中圧電極及びステム間に配され、その中
圧電極に接続された継線とを有する陰極線管の電極間リ
ーク電流測定方法において、高圧電極に高圧電圧を印加
すると共に、中圧電極に接地電圧を印加した状態で、高
圧電極及び中圧電極間のリーク電流並びに高圧電極及び
低圧電極間のリーク電流を測定し、高圧電極に高圧電圧
を印加すると共に、中圧電極に中圧電圧を印加した状態
で、中圧電極に接続された継線及び低圧電極間のリーク
電流を測定するようにしたので、高圧電極と、中圧電極
及び低圧電極との間のリーク電流並びに中圧電極と低圧
電極との間のリーク電流を共に高感度且つ高精度で測定
することのできる陰極線管の電極間リーク電流測定方法
を得ることができる。上述せるた第２の本発明によれ
ば、高圧電極、中圧電極及び低圧電極を備える電子銃
と、低圧電極に近接する如く中圧電極及びステム間に配
され、その中圧電極に接続された継線とを有する陰極線
管の電極間リーク電流測定装置において、高圧電極及び
接地間に接続され、その高圧電極に高圧電圧を印加する
高圧電源と、継線を通じて中圧電極に接続された可動接
点並びにその可動接点が切換え接続される第１及び第２
の固定接点を備えるスイッチ手段と、そのスイッチ手段
の第１の固定接点及び接地間に接続された第１の電流計
と、スイッチ手段の第２の固定接点及び接地間に接続さ
れ、そのスイッチ手段を通じて、中圧電極に中圧電圧を
印加する中圧電源と、低圧電極及び接地間に接続された
第２の電流計とを有し、可動接点が第１の固定接点に接
続されるようにスイッチ手段を切り換えた状態で、第１
の電流計によって高圧電極及び中圧電極間のリーク電流
を測定すると共に、第２の電流計によって高圧電極及び
低圧電極間のリーク電流を測定し、可動接点が第２の固
定接点に接続されるようにスイッチ手段を切り換えた状
態で、第２の電流計によって中圧電極に接続された継線
及び低圧電極間のリーク電流を測定するようにしたの
で、高圧電極と、中圧電極及び低圧電極との間のリーク
電流並びに中圧電極と低圧電極との間のリーク電流を共
に高感度且つ高精度で測定することができると共に、リ
ーク電流の測定を迅速に行い得、しかも、回路構成が簡
単となる陰極線管の電極間リーク電流測定装置を得るこ
とができる。上述せる第３の本発明によれば、高圧電
極、中圧電極及び低圧電極を備える電子銃と、低圧電極
に近接する如く中圧電極及びステム間に配され、その中
圧電極に接続された継線とを有する陰極線管の検査方法
において、高圧電極に高圧電圧を印加すると共に、中圧
電極に接地電圧を印加した状態で、高圧電極及び中圧電
極間のリーク電流並びに高圧電極及び低圧電極間のリー
ク電流を測定し、高圧電極に高圧電圧を印加すると共
に、中圧電極に中圧電圧を印加した状態で、中圧電極に
接続された継線及び低圧電極間のリーク電流を測定し、
高圧電極及び中圧電極間のリーク電流、高圧電極及び低
圧電極間のリーク電流並びに中圧電極に接続された継線
及び低圧電極間のリーク電流のいずれかが、それぞれの
リーク電流の閾値以上であるときは、陰極線管を不合格
製品と判定するようにしたので、陰極線管の良否を高感
度且つ高精度に検査することのできる陰極線管の検査方
法を得ることができる。上述の第４の本発明によれば、
高圧電極、中圧電極及び低圧電極を備える電子銃と、低
圧電極に近接する如く中圧電極及びステム間に配され、
その中圧電極に接続された継線とを有する陰極線管の検
査装置において、高圧電極及び接地間に接続され、その
高圧電極に高圧電圧を印加する高圧電源と、継線を通じ
て中圧電極に接続された可動接点並びにその可動接点が
切換え接続される第１及び第２の固定接点を備えるスイ
ッチ手段と、そのスイッチ手段の第１の固定接点及び接
地間に接続された第１の電流計と、スイッチ手段の第２
の固定接点及び接地間に接続され、そのスイッチ手段を
通じて、中圧電極に中圧電圧を印加する中圧電源と、低
圧電極及び接地間に接続された第２の電流計とを有し、
可動接点が第１の固定接点に接続されるようにスイッチ
手段を切り換えた状態で、第１の電流計によって高圧電
極及び中圧電極間のリーク電流を測定すると共に、第２
の電流計によって高圧電極及び低圧電極間のリーク電流
を測定し、可動接点が第２の固定接点に接続されるよう
にスイッチ手段を切り換えた状態で、第２の電流計によ
って中圧電極に接続された継線及び低圧電極間のリーク
電流を測定し、高圧電極及び中圧電極間のリーク電流、
高圧電極及び低圧電極間のリーク電流並びに中圧電極に
接続された継線及び低圧電極間のリーク電流のいずれか
が、それぞれのリーク電流の閾値以上であるときは、陰
極線管を不合格製品と判定するようにしたので、陰極線
管の良否を高感度且つ高精度に検査することができると
共に、リーク電流の測定を迅速に行い得、しかも、回路
構成が簡単となる陰極線管の検査装置を得ることができ
る。According to the first aspect of the present invention, an electron gun including a high-voltage electrode, a medium-voltage electrode and a low-voltage electrode is disposed between the medium-voltage electrode and the stem close to the low-voltage electrode. In a method for measuring a leak current between electrodes of a cathode ray tube having a connecting wire connected to an electrode, a high voltage is applied to a high voltage electrode, and a ground voltage is applied to a medium voltage electrode. The leak current between the high-voltage electrode and the low-voltage electrode is measured, and the high-voltage electrode is applied to the high-voltage electrode, and the medium-voltage electrode is applied with the medium-voltage voltage. Since the leak current between the low voltage electrodes is measured, the leak current between the high voltage electrode, the medium voltage electrode and the low voltage electrode, and the leak current between the medium voltage electrode and the low voltage electrode are both highly sensitive and highly accurate. Can be measured with Electrode leak current measuring method of polar tube can be obtained. According to the second aspect of the present invention, the electron gun including the high-voltage electrode, the medium-voltage electrode, and the low-voltage electrode is disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode, and is connected to the medium-voltage electrode. In a device for measuring the inter-electrode leakage current of a cathode ray tube having a connected wire, a high-voltage power supply connected between the high-voltage electrode and the ground and applying a high-voltage to the high-voltage electrode, and a movable device connected to the medium-voltage electrode through the connected wire First and second contacts and their movable contacts are switchably connected
Switch means having a fixed contact, a first ammeter connected between the first fixed contact and the ground of the switch means, and the switch means connected between a second fixed contact and the ground of the switch means. And a second ammeter connected between the low-voltage electrode and the ground so that the movable contact is connected to the first fixed contact. With the switch means switched, the first
The leakage current between the high-voltage electrode and the medium-voltage electrode is measured by the ammeter, and the leakage current between the high-voltage electrode and the low-voltage electrode is measured by the second ammeter, and the movable contact is connected to the second fixed contact. With the switch means switched as described above, the second ammeter measures the leakage current between the connecting wire connected to the medium-voltage electrode and the low-voltage electrode, so that the high-voltage electrode, the medium-voltage electrode and the low-voltage electrode are measured. And the leak current between the medium voltage electrode and the low voltage electrode can be measured with high sensitivity and high accuracy, and the leak current can be measured quickly, and the circuit configuration is simple. Thus, a device for measuring a leak current between electrodes of a cathode ray tube can be obtained. According to the third aspect of the present invention, the electron gun including the high-voltage electrode, the medium-voltage electrode, and the low-voltage electrode is disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode, and is connected to the medium-voltage electrode. In a method of inspecting a cathode ray tube having a connecting wire, a high voltage is applied to a high voltage electrode, and a leakage current between the high voltage electrode and the medium voltage electrode, and a high voltage electrode and a low voltage electrode are applied while a ground voltage is applied to the medium voltage electrode. The high-voltage is applied to the high-voltage electrode, and the medium-voltage is applied to the high-voltage electrode, and the leak current between the connecting wire connected to the medium-voltage electrode and the low-voltage electrode is measured. ,
The leakage current between the high-voltage electrode and the medium-voltage electrode, the leakage current between the high-voltage electrode and the low-voltage electrode, and the leakage current between the connecting wire connected to the medium-voltage electrode and the low-voltage electrode are equal to or greater than the respective leakage current thresholds. In some cases, since the cathode ray tube is determined to be a rejected product, it is possible to obtain a cathode ray tube inspection method capable of inspecting the quality of the cathode ray tube with high sensitivity and high accuracy. According to the fourth aspect of the present invention,
An electron gun having a high-voltage electrode, a medium-voltage electrode and a low-voltage electrode, and disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode,
In the inspection apparatus for a cathode ray tube having a connecting wire connected to the medium-voltage electrode, a high-voltage power supply connected between the high-voltage electrode and the ground and applying a high-voltage to the high-voltage electrode is connected to the medium-voltage electrode through the connecting wire. Switch means comprising a fixed movable contact and first and second fixed contacts to which the movable contact is switched and connected; a first ammeter connected between the first fixed contact of the switch means and ground; Second switch means
And a second ammeter connected between the fixed contact and ground, applying a medium voltage to the medium voltage electrode through the switch means, and a second ammeter connected between the low voltage electrode and ground,
With the switch means switched so that the movable contact is connected to the first fixed contact, the first ammeter measures the leakage current between the high-voltage electrode and the medium-voltage electrode, and
The leak current between the high-voltage electrode and the low-voltage electrode is measured by the ammeter, and the switch is switched so that the movable contact is connected to the second fixed contact. Measure the leakage current between the connection wire and the low-voltage electrode, the leakage current between the high-voltage electrode and the medium-voltage electrode,
If any of the leakage current between the high-voltage electrode and the low-voltage electrode and the leakage current between the connecting wire connected to the medium-voltage electrode and the low-voltage electrode is equal to or greater than the respective leakage current thresholds, the cathode ray tube is regarded as a rejected product. Since the determination is made, the quality of the cathode ray tube can be inspected with high sensitivity and high accuracy, and the leak current can be measured quickly, and further, a cathode ray tube inspection device with a simple circuit configuration can be obtained. be able to.
【図１】本発明の実施例（１）のリーク電流測定回路を
示す回路図FIG. 1 is a circuit diagram showing a leak current measuring circuit according to an embodiment (1) of the present invention.
【図２】本発明の実施例（２）のリーク電流測定回路を
示す回路図FIG. 2 is a circuit diagram showing a leakage current measuring circuit according to an embodiment (2) of the present invention.
【図３】陰極線管のユニポテンシャル型電子銃を示す回
路図FIG. 3 is a circuit diagram showing a unipotential type electron gun of a cathode ray tube.
【図４】従来例のリーク電流測定回路を示す回路図FIG. 4 is a circuit diagram showing a conventional leak current measuring circuit.
【図５】先行例のリーク電流測定回路を示す回路図FIG. 5 is a circuit diagram showing a leak current measuring circuit of a prior example.
Ｇ１〜Ｇ６グリッド Ｋ カソード Ｈ ヒータ １、２、６、７、８電源 ３、９、１１切換えスイッチ ４、５、１０、１２、１３電流計 G1 to G6 grid K Cathode H Heater 1, 2, 6, 7, 8 Power supply 3, 9, 11 Changeover switch 4, 5, 10, 12, 13 Ammeter
Claims (4)
る電子銃と、上記低圧電極に近接する如く上記中圧電極
及びステム間に配され、該中圧電極に接続された継線と
を有する陰極線管の電極間リーク電流測定方法におい
て、 上記高圧電極に高圧電圧を印加すると共に、上記中圧電
極に接地電圧を印加した状態で、上記高圧電極及び上記
中圧電極間のリーク電流並びに上記高圧電極及び上記低
圧電極間のリーク電流を測定し、 上記高圧電極に高圧電圧を印加すると共に、上記中圧電
極に中圧電圧を印加した状態で、上記中圧電極に接続さ
れた継線及び上記低圧電極間のリーク電流を測定するこ
とを特徴とする陰極線管の電極間リーク電流測定方法。1. An electron gun comprising a high-voltage electrode, a medium-voltage electrode and a low-voltage electrode, and a connecting wire disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode and connected to the medium-voltage electrode. In the method for measuring a leak current between electrodes of a cathode ray tube, a high voltage is applied to the high voltage electrode, and a leak current between the high voltage electrode and the medium voltage electrode and Measure the leak current between the high-voltage electrode and the low-voltage electrode, apply a high-voltage to the high-voltage electrode, apply a medium-voltage to the medium-voltage electrode, and connect the connecting wires to the medium-voltage electrode. A method for measuring a leak current between electrodes of a cathode ray tube, wherein the leak current between the low-voltage electrodes is measured.
る電子銃と、上記低圧電極に近接する如く上記中圧電極
及びステム間に配され、該中圧電極に接続された継線と
を有する陰極線管の電極間リーク電流測定装置におい
て、 上記高圧電極及び接地間に接続され、該高圧電極に高圧
電圧を印加する高圧電源と、 上記継線を通じて上記中圧電極に接続された可動接点並
びに該可動接点が切換え接続される第１及び第２の固定
接点を備えるスイッチ手段と、 該スイッチ手段の上記第１の固定接点及び上記接地間に
接続された第１の電流計と、 上記スイッチ手段の上記第２の固定接点及び上記接地間
に接続され、該スイッチ手段を通じて、上記中圧電極に
中圧電圧を印加する中圧電源と、 上記低圧電極及び上記接地間に接続された第２の電流計
とを有し、 上記可動接点が上記第１の固定接点に接続されるように
上記スイッチ手段を切り換えた状態で、上記第１の電流
計によって上記高圧電極及び上記中圧電極間のリーク電
流を測定すると共に、上記第２の電流計によって上記高
圧電極及び上記低圧電極間のリーク電流を測定し、 上記可動接点が上記第２の固定接点に接続されるように
上記スイッチ手段を切り換えた状態で、上記第２の電流
計によって上記中圧電極に接続された継線及び上記低圧
電極間のリーク電流を測定するようにしたことを特徴と
する陰極線管の電極間リーク電流測定装置。2. An electron gun comprising a high-voltage electrode, a medium-voltage electrode and a low-voltage electrode, and a connecting wire disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode and connected to the medium-voltage electrode. In a device for measuring a leak current between electrodes of a cathode ray tube, a high-voltage power supply connected between the high-voltage electrode and ground and applying a high-voltage to the high-voltage electrode; a movable contact connected to the medium-voltage electrode through the connection line; Switch means having first and second fixed contacts to which the movable contact is switched and connected; a first ammeter connected between the first fixed contact and the ground of the switch means; and the switch means A medium-voltage power supply connected between the second fixed contact and the ground, and applying a medium-voltage to the medium-voltage electrode through the switch means; and a second voltage connected between the low-voltage electrode and the ground. Ammeter and A leak current between the high-voltage electrode and the medium-voltage electrode is measured by the first ammeter in a state where the switch is switched so that the movable contact is connected to the first fixed contact. A leak current between the high-voltage electrode and the low-voltage electrode is measured by the second ammeter, and the switch is switched so that the movable contact is connected to the second fixed contact. A leak current measuring device between electrodes of a cathode ray tube, wherein a leak current between the connecting wire connected to the intermediate voltage electrode and the low voltage electrode is measured by a second ammeter.
る電子銃と、上記低圧電極に近接する如く上記中圧電極
及びステム間に配され、該中圧電極に接続された継線と
を有する陰極線管の検査方法において、 上記高圧電極に高圧電圧を印加すると共に、上記中圧電
極に接地電圧を印加した状態で、上記高圧電極及び上記
中圧電極間のリーク電流並びに上記高圧電極及び上記低
圧電極間のリーク電流を測定し、 上記高圧電極に高圧電圧を印加すると共に、上記中圧電
極に中圧電圧を印加した状態で、上記中圧電極に接続さ
れた継線及び上記低圧電極間のリーク電流を測定し、 上記高圧電極及び上記中圧電極間のリーク電流、上記高
圧電極及び上記低圧電極間のリーク電流並びに上記中圧
電極に接続された継線及び上記低圧電極間のリーク電流
のいずれかが、それぞれのリーク電流の閾値以上である
ときは、上記陰極線管を不合格製品と判定するようにし
たことを特徴とする陰極線管の検査方法。3. An electron gun having a high-voltage electrode, a medium-voltage electrode and a low-voltage electrode, and a connecting wire disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode and connected to the medium-voltage electrode. In the method of inspecting a cathode ray tube having a high voltage applied to the high voltage electrode and a ground voltage applied to the medium voltage electrode, a leak current between the high voltage electrode and the medium voltage electrode, and the high voltage electrode and Measure the leak current between the low-voltage electrodes, apply a high-voltage to the high-voltage electrode, and apply a medium-voltage to the medium-voltage electrode. The leakage current between the high-voltage electrode and the medium-voltage electrode, the leakage current between the high-voltage electrode and the low-voltage electrode, and the leakage current between the connecting line connected to the medium-voltage electrode and the low-voltage electrode of When any one of them is equal to or more than the respective threshold value of the leak current, the cathode ray tube is determined to be a rejected product.
る電子銃と、上記低圧電極に近接する如く上記中圧電極
及びステム間に配され、該中圧電極に接続された継線と
を有する陰極線管の検査装置において、 上記高圧電極及び接地間に接続され、該高圧電極に高圧
電圧を印加する高圧電源と、 上記継線を通じて上記中圧電極に接続された可動接点並
びに該可動接点が切換え接続される第１及び第２の固定
接点を備えるスイッチ手段と、 該スイッチ手段の上記第１の固定接点及び上記接地間に
接続された第１の電流計と、 上記スイッチ手段の上記第２の固定接点及び上記接地間
に接続され、該スイッチ手段を通じて、上記中圧電極に
中圧電圧を印加する中圧電源と、 上記低圧電極及び上記接地間に接続された第２の電流計
とを有し、 上記可動接点が上記第１の固定接点に接続されるように
上記スイッチ手段を切り換えた状態で、上記第１の電流
計によって上記高圧電極及び上記中圧電極間のリーク電
流を測定すると共に、上記第２の電流計によって上記高
圧電極及び上記低圧電極間のリーク電流を測定し、 上記可動接点が上記第２の固定接点に接続されるように
上記スイッチ手段を切り換えた状態で、上記第２の電流
計によって上記中圧電極に接続された継線及び上記低圧
電極間のリーク電流を測定し、 上記高圧電極及び上記中圧電極間のリーク電流、上記高
圧電極及び上記低圧電極間のリーク電流並びに上記中圧
電極に接続された継線及び上記低圧電極間のリーク電流
のいずれかが、それぞれのリーク電流の閾値以上である
ときは、上記陰極線管を不合格製品と判定するようにし
たことを特徴とする陰極線管の検査装置。4. An electron gun having a high-voltage electrode, a medium-voltage electrode, and a low-voltage electrode, and a connecting wire disposed between the medium-voltage electrode and the stem so as to be close to the low-voltage electrode and connected to the medium-voltage electrode. A cathode ray tube inspection device, comprising: a high-voltage power supply connected between the high-voltage electrode and the ground, and applying a high-voltage to the high-voltage electrode; and a movable contact and the movable contact connected to the intermediate-voltage electrode through the connecting wire. Switch means having first and second fixed contacts that are switchably connected; a first ammeter connected between the first fixed contact of the switch means and the ground; and a second ammeter connected to the switch means. And a second ammeter connected between the low voltage electrode and the ground, the medium voltage power supply being connected between the fixed contact and the ground and applying a medium voltage to the medium voltage electrode through the switch means. Has the above movable With the switch means switched so that the contact is connected to the first fixed contact, the first ammeter measures the leak current between the high-voltage electrode and the medium-voltage electrode, and The leak current between the high-voltage electrode and the low-voltage electrode is measured by the ammeter, and the second ammeter is switched with the switch means switched so that the movable contact is connected to the second fixed contact. Measuring the leak current between the connecting wire connected to the medium-voltage electrode and the low-voltage electrode, the leak current between the high-voltage electrode and the medium-voltage electrode, the leak current between the high-voltage electrode and the low-voltage electrode, and When any of the leakage current between the connecting wire connected to the pressure electrode and the low voltage electrode is equal to or more than the threshold value of the respective leakage current, the cathode ray tube is determined as a rejected product. Cathode-ray tube of the inspection apparatus characterized by a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23361393A JP3284693B2 (en) | 1993-09-20 | 1993-09-20 | Method and apparatus for measuring leakage current between electrodes of cathode ray tube, and method and apparatus for inspecting cathode ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23361393A JP3284693B2 (en) | 1993-09-20 | 1993-09-20 | Method and apparatus for measuring leakage current between electrodes of cathode ray tube, and method and apparatus for inspecting cathode ray tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0785795A JPH0785795A (en) | 1995-03-31 |
| JP3284693B2 true JP3284693B2 (en) | 2002-05-20 |
Family
ID=16957796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23361393A Expired - Fee Related JP3284693B2 (en) | 1993-09-20 | 1993-09-20 | Method and apparatus for measuring leakage current between electrodes of cathode ray tube, and method and apparatus for inspecting cathode ray tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3284693B2 (en) |
-
1993
- 1993-09-20 JP JP23361393A patent/JP3284693B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0785795A (en) | 1995-03-31 |
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